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1 . UNIT - I ( a ) What is the difference between steam and flash distillation? ( 5 ) ( b ) A continuous

1.
UNIT-I
(a) What is the difference between steam and flash distillation?
(5)
(b) A continuous distillation column is to be designed 7000 kg/hr of liquid mixture with 60% methanol and 40 mole % water into an overhead product containing 90 mole % methanol and water product 95 mole % water. Reflux ratio of 2 times the minimum value is used. Assume relative volatility of methanol and water is 3. Calculate (i) the moles of overhead of water product. (ii) Number of ideal trays and feed tray if the feed is at boiling point. (10)
2.
(a) Explain, how azeotropic mixtures are separated?
(5)
(b) In a binary mixture the vapor pressure of A is 800 mm Hg and that of B is 400 mm Hg. Estimate the vapor composition in equilibrium with the liquid if the composition in liquid phase is 50 mole % A.

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